ADL400 Track-type Multi-functional Energy Meter is an intelligent instrument designed primarily for the power system, industrial and mining enterprises, and public utility facilities to meet their energy statistics and management needs. It boasts high accuracy, compact size, and easy installation. It integrates common electrical parameter measurements, energy metering, and evaluation management, providing statistics on various energy data for up to 48 months. It features 2 to 31 harmonic order detection and total harmonic content measurement. Equipped with an RS485 communication interface, it supports MODBUS-RTU or DL/T645 protocols. This power meter is widely applicable in various control systems, SCADA systems, and energy management systems.